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#include "api.h"
String* api_string_init() {
String* pString = (String*) malloc(sizeof(String));
if (pString != NULL) {
pString->len = 0;
pString->data = (char*) malloc(sizeof(char));
if (pString->data == NULL) {
fprintf(stderr, "malloc() failed\n");
exit(EXIT_FAILURE);
}
pString->data[0] = '\0';
} else {
fprintf(stderr, "malloc() failed\n");
exit(EXIT_FAILURE);
}
return pString;
}
size_t api_string_writefunc(void* ptr, size_t size, size_t nmemb, String* hString) {
String* pString = hString;
size_t new_len = pString->len + size * nmemb;
pString->data = realloc(pString->data, new_len + 1);
if (pString->data == NULL) {
fprintf(stderr, "realloc() failed\n");
exit(EXIT_FAILURE);
}
memcpy(pString->data + pString->len, ptr, size * nmemb);
pString->data[new_len] = '\0';
pString->len = new_len;
return size * nmemb;
}
String* api_curl_data(char* url) {
String* pString = api_string_init();
CURL* curl = curl_easy_init();
CURLcode res;
curl_global_init(CURL_GLOBAL_DEFAULT);
if (curl) {
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, api_string_writefunc);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &pString->data);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
if (res != CURLE_OK)
return NULL;
}
return pString;
}
double api_get_current_price(char* ticker_name_string) {
double val = iex_get_current_price(ticker_name_string);
if (val != -1)
return val;
val = alphavantage_get_current_price(ticker_name_string);
if (val != -1)
return val;
val = coinmarketcap_get_current_price(ticker_name_string);
if (val != -1)
return val;
return -1;
}
double iex_get_current_price(char* ticker_name_string) {
size_t ticker_name_len = strlen(ticker_name_string);
char* iex_api_string = calloc(64, sizeof(char));
memcpy(iex_api_string, "https://api.iextrading.com/1.0/stock/", 37);
memcpy(&iex_api_string[37], ticker_name_string, ticker_name_len);
memcpy(&iex_api_string[37 + ticker_name_len], "/quote/latestPrice", 18);
String* pString = api_curl_data(iex_api_string);
free(iex_api_string);
if (strcmp(pString->data, "Unknown symbol") == 0) {
api_string_destroy(&pString);
return -1;
}
double ret = strtod(pString->data, NULL);
api_string_destroy(&pString);
return ret;
}
double alphavantage_get_current_price(char* ticker_name_string) {
char* av_str = "https://www.alphavantage.co/query?function=TIME_SERIES_INTRADAY&interval=1min&apikey=DFUMLJ1ILOM2G7IH&datatype=csv&symbol=";
char* alphavantage_api_string = calloc(160, sizeof(char));
memcpy(alphavantage_api_string, av_str, 160);
size_t av_len = strlen(alphavantage_api_string);
memcpy(&alphavantage_api_string[av_len], ticker_name_string, 10);
String* pString = api_curl_data(alphavantage_api_string);
if (pString->data[0] == '{'){
api_string_destroy(&pString);
memset(alphavantage_api_string, '\0', 160);
av_str = "https://www.alphavantage.co/query?function=TIME_SERIES_DAILY&apikey=DFUMLJ1ILOM2G7IH&datatype=csv&symbol=";
memcpy(alphavantage_api_string, av_str, 160);
av_len = strlen(alphavantage_api_string);
memcpy(&alphavantage_api_string[av_len], ticker_name_string, 10);
pString = api_curl_data(alphavantage_api_string);
}
if (pString->data[0] == '{'){
free(alphavantage_api_string);
api_string_destroy(&pString);
return -1;
}
int i = 0;
for (int j = 0; j < 9; i++, j++)
while (pString->data[i] != ',')
i++;
char* price_string = (char*)calloc(16, 1);
for (int j = 0; pString->data[i] != ','; i++, j++)
price_string[j] = pString->data[i];
free(alphavantage_api_string);
double ret = strtod(price_string, NULL);
free(price_string);
api_string_destroy(&pString);
return ret;
}
double coinmarketcap_get_current_price(char* ticker_name_string) {
char* cmc_str = "https://api.coinmarketcap.com/v1/ticker/";
char* coinmarketcap_api_string = calloc(64, sizeof(char));
memcpy(coinmarketcap_api_string, cmc_str, 40);
memcpy(&coinmarketcap_api_string[40], ticker_name_string, 20);
String* pString = api_curl_data(coinmarketcap_api_string);
if (pString->data[0] == '{'){
free(coinmarketcap_api_string);
api_string_destroy(&pString);
return -1;
}
int i = 0;
for (int j = 0; j < 19; i++, j++)
while (pString->data[i] != '"')
i++;
char* price_string = (char*)calloc(16, 1);
for (int j = 0; pString->data[i] != '"'; i++, j++)
price_string[j] = pString->data[i];
free(coinmarketcap_api_string);
double ret = strtod(price_string, NULL);
free(price_string);
api_string_destroy(&pString);
return ret;
}
void api_string_destroy(String** phString) {
String* pString = *phString;
free(pString->data);
free(*phString);
*phString = NULL;
}
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